Communication Engineering Departement, University of Technology


Fiber Bragg gratings (FBGs) are one of the most effective technologies because
of their suitability in many applications of the fiber techniques. Moreover, it can be utilized
in sensing elements and estimating the physical parameters of the optical fiber. In the
current research, various fiber bragg lengths are considered and a comparative
investagtion is made for the performance of the refractive index modulation at two different
apodization profiles namely: Gaussian index profiles and uniform index profiles. Also, a
comparative study of the optical communication system performance has been carried out
of refractive indexes with two apodization functions. A comprehensive comparison in terms
of gain, noise figure, OSNR, quality factor, bit error rate and power has been performed
where the performance of the optical system is studied under various optical channel
lengths (from 25 km to 100 km) with various FBG lengths, which are ranged from 4 mm to
14 mm in both apodization profiles, i.e. uniform profile and Gaussian profile. In order to
carry out the simulation of the performance RZ, the optisystem version 9 is used for single
channel based on over single mode fiber. The results showed that the maximum Q.F. as the
performance parameter is obtained at the FBG length of 8 mm at all optical lengths.
Moreover, the varation effect of optical fiber channel length was greater than the varation
effect of refractive index for all the studied parameters (gain, noise figure, OSNR, quality
factor, BER, and power) for two apodization functions.